Mixer-dosimeter-dispenser for abrasives and like, specially for lapping machines and like



Apnl 23, 1968 F. MELCHIORRE 3,379,347

MIXER-DOSIMETER-DISPENSER FOR ABRASIVES AND LIKE, SPECIALLY FOR LAPPINGMACHINES AND LIKE Filed March 5, 1967 m 1)! Ill 14 11 INVENTOR.flwces'co 461. 0002.2

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United States Patent 3,379,347 MIXER-DGSiMETER-DISPENSER FOR ABRA- SiVEgAND LIKE, SPEQIALLY FOR LAP- PENG MziCliiliNiES AND LIKE Frances-coMeichiorre, Viale Piemonte 11, Cinisello Balsamo, Miian, Italy FiledMar. 3, 1967, Ser. No. 620,499 Claims priority, application Italy, Mar.3, 19615, 762,623 6 Claims. (Cl. 222231) ABSTRACT 0F THE DXSCLOSURE Amixing-dosing-distributing device for abrasive stufis suspended in watercomprising a vertical disc partially submerged in the suspension androtating so that the abrasive stuff is transported by the disc to aheight above the suspension where a spatula is provided to scrape theabrasive stuff off the disc and direct it to a distribution zone.

This invention concerns; a mixer-dosimeter-dispenser for abrasives andlike, specially for lapping machines and like.

It is well known that in machines using abrasive materials mixed withliquids, there is the absolute need of ensuring that said abrasive bedispensed in a continuous and constant way, with a maximum ofreliability as well as under the provision of a wide quantitativecontrol.

On the contrary the situation is that mixers-dosimeters now in use donot include any system suitable for obtaining the typical guarantees forconstance and continuity now referred to.

in some of the more known types the substance being in suspension intothe liquid is made to pass through regulatable slits, but in a shorttime the passage is obstructed owing to bunching of said substance, withensuing difiiculties concerning the evenness of operation for themachine to be fed. Said diificulties, i.e. unevenness and discontinuityof feed, are particularly objectionable for lapping machines.

It is the main object of this invention to obviate the above referred todifiiculty, through the adoption of a mixer-dosimeter-dispenser ofabrasives mixed with liquids, for lapping machines and like, which mayensure the evenness and precise dosage of the abrasive material, thewhole through simple and economical ways, which may also be easilycontrolled in operation.

These and other objects are obtained through themixer-dosimeter-dispenser devised according to this invention, belongingto the type including a tank for receiving the abrasive in a liquidmedium, and a stirrer, for instance of the paddle type, which ischaracterized in that it includes a dipping element, for instance arotatable disc, set along a vertical plane, which emerges topwise fromthe surface of the liquid-abrasive mixture, at least one scrapingspatule, suitable to be brought into contact with the upper portion ofsaid disc, and one or more canals which gather the material beingscraped upon the dipping element (disc) of the spatule and apportion thesame to the machine in operation, such as a lapper or like.

Another feature of this invention lies in the special embodiment for themotions transmission: one motor sets in rotations the paddle stirrer, orother, suitable device, providing a horizontal motion, and the extensiontopwise of the shaft of said stirrer transmits on its turn, by friction,the motion to the vertical carrier-disc. It may also happen that disc bedriving and the central stirrers shaft be driven.

It must be also added that spatule, or spatules, may be 3,3?934'?Patented Apr. 23, 1968 oriented, so as to obtain, through theirdifferent contact position upon the dipping element, for instance arotating disc, the control of quantity of abrasive to be distributed tothe machine.

The invention shall now be better described with reference to anembodiment, being given only as a qualitative and not limitativeexample, and as shown in the enclosed drawing, in which:

FIG. 1 shows schematically, in a vertical section, thedosimetendispenser devised according to this invention; and

FIG. 2 shows schematically as well the dosimeter-dispenser as seen fromits top.

With reference to the enclosed drawing, with 1 is shown the tankcontaining the abrasive substance, in suspension into the liquid 2, andwith 3 the paddle stirrer or any other suitable system, which rotateshorizontally slightly above the bottom la of tank 1. A vertical shaft 4,which passes through the bottom in and carries at its end a pulley 5which receives the motion from an engine (not shown) through a belt 6.Shaft 4 extends topwise within the tank 1 and is fixed to a drum '1'which has, at a given height, an annular enlargement 7a. The stirrer 3is driven by the drum 7.

According to the invention there is provided within the tank 1, a disc8, vertically placed and being idle, with its hub 8:: around pivot pin 9(FIG. 2), which is made fast to a side part of tank 1. Disc 8 has itsfore surface (shown in FIG. 1) in contact with annular enlargement 7a,so that, when stirrer 3 is in motion, for instance as shown with arrow f(FlG. 2), also drum 7 and enlargement 7a rotate along the arrow f (FIG.1), and therefore, by friction disc 8 may rotate along arrow i (H6. 1).As this disc 8 emerges for a good part from the surface 2a of the liquidcontaining the abrasive, in its rotation it will carry upwise a film ofthe said liquid, and therefore a certain amount, being constant andeven, of abrasive.

Adjacent the upper part of disc 8 there is provided at least one spatule1 which scrapes the carried mixture and makes it fall upon a gatheringrod 11 of circular section, so as to offer to the emery a circularsurface which may not form deposits. From this rod 11 abrasive passesinto a small canal 12, upon the middle plane of which there is placed asecond collecting rod 13, which dispenses it dropwise to the operatingmachine (not shown in the drawing).

According to this invention, the disposition and/ or the position ofspatule lit with reference to disc 8, may be varied, so as to occupyupon the same respectively a circular crown of different width, or to beat a different distance from the center of the disc itself. in this wayone may change in a. very simple way the quantity of abrasive beingdispensed by the dosimeter.

This may be obtained by operating upon the support 14 of said spatule,which is rocking'ly adjustable in the said Ways, upon a pivot 15', forinstance through a knob 16, that turns a worm and worm gear.

Another possibility of regulation for the dosing of abrasive is to beobtained through the variation of the rotation, speed of disc 3. To thisend one may provide a kinematic coupling through a pair of gears (notshown), between the driving shaft 4 and the drum 7, in order to obtain adifierent speed of the drum, and therefore of the disc 8, being the samethe rotation speed of stirrer 3.

Although only one embodiment has been described for the invention,devised according to these concepts, it is clear that in practice manymore may be suggested, always based upon the main concepts now referredto, which define the invention, without leaving the law-full protectionof the invention itself.

What I claim is:

1. A mixer-dosimeter-dispenser for abrasives in a liquid medium, saiddispenser comprising:

(A) A tank containing the abrasive in the liquid medium,

(B) A paddle stirrer in said tank,

(C) A disc,

(D) Means supporting said disc in said tank for rotation of a verticalfiat face thereof about a horizontal axis, said supporting means beingdisposed so that the lower portion of said fiat face is disposed beneaththe surface of said liquid abrasive and the upper portion of said flatface is disposed above said surface,

(E) Means to continuously rotate said disc about said axis so that theupper portion of the flat face progressively moves into and under thesurface of said liquid abrasive mixture and the lower portion of thefiat face progressively emerges from the surface of said liquid abrasivemixture carrying liquid-abrasive mixture thereon,

(F) A spatula,

(G) Means to hold said spatula in bearing engagement with a part of theupper portion of said flat face so as to scrape continuouslyliquid-abrasive mixture therefrom,

(H) Means for distributing liquid-abrasive mixture to a utilizationmechanism, and,

(I) Means for collecting liquid-abrasive material scraped from the flatface by the spatula and transferring the same to the distributing means.

2. A mixer-dosimeter-dispenser as set forth in claim 1 wherein:

(A) The paddle stirrer is adjacent the bottom of the tank and turnsabout a vertical axis,

(B) A vertical rotating shaft drives the stirrer and extends into thetank alongside said fiat face of the disc, the longitudinal axis of saidshaft intersecting the horizontal axis of rotation of said disc,

(C) The continuous rotating means for the disc constitutes a drum turnedby said shaft and an annular enlargement on said drum in frictionalengagement with the fiat face of the disc, and,

(D) A horizontal pivot pin is carried by the tank and on which the discrotatably idles, said pin constituting the disc supporting means.

3. A mixer-dosimeter-dispenser as set forth in claim 2, wherein the drumis mounted on and turns with said shaft.

4, A mixer dosimeter-dispenser as set forth in claim 1, wherein means isincluded to vary the position of the, spatula bearing on the flat faceof the disc so as to vary the quantity of abrasive-liquid material beingcollected and supplied.

5. A mixer-dosimeterdispenser as set forth in claim 1, wherein thespatula holding means includes means tolselectively vary the position ofthe spatula about a horizontal axis perpendicular to the flat face ofthe disc so as to vary the quantity of abrasive-liquid material beingcollected and supplied.

6. A mixer'dosimeter-dispenser as set forth in claim 1, wherein thecollecting means is an inclined circular rod having an upper portionarranged to receive abrasiveliquid mixture falling from the spatula andthereby provide a circular convex surface on which the abrasive will notform deposits.

References Cited UNITED STATES PATENTS 783,251 2/ 1905 Einstein 222--3421,093,376 4/1914 Bird 222-236 1,519,664 12/ 1924 Campbell 222-2361,882,439 10/1932 Murphy 222-414 X 2,981,522 4/1961 Spragens 222342WALTER SOBIN, Primary Examiner.

